FLEXIBLE FILTER LOGIC FOR MULTI-MODE FILTERING OF GRAPHICAL TEXTURE DATA

摘要

Multi-mode texture filters suitable for performing both bilinear filtering based on a fractional texture address and generating a weighted average of a group of texel values based on predetermined texel weighting coefficients as dependent on a filter mode signal. In embodiments, the weighted average may be accumulated over a variety of filter footprints. In embodiments, multi-mode texture filter logic includes a plurality of flexible filter blocks. In further embodiments, a pair of flexible filter blocks staged with each performing one lerp phase in the bilinear filter mode while a pair of flexible filter blocks in the flexible filter mode generate a weighted average over a pair of texels of a texel quad. In embodiments, each flexible filter block has a same microarchitecture, enabling an efficient utilization in either bilinear filter or flexible filter mode.

主权项

1. A graphics processing system with a multi-mode texture filter, the filter comprising:
one or more signal input to receive a plurality of texel values and a filter mode signal; logic circuitry communicatively coupled to the one or more signal input, wherein the logic circuitry is operable in a plurality of modes selectable by the filter mode signal, the logic circuitry in a first mode perform bilinear interpolation over a group of neighboring texel values based on coefficients indicative of a fractional texture address, and the logic circuitry in a second mode to perform a weighted averaging over the group of neighboring texel values based on the coefficients, wherein each of the coefficients is indicative of a weighting associated with one of the multiple texel values; and one or more output signal line communicatively coupled to the logic circuitry to output the filtered texture data.